Apparatus for pumping or compressing gas and air.



No. 660,253. Patented Oct. 23, L900.

J. KEITH.

APPARATUS FOR PUMPING OB GOMPBESSING GAS AND AIR.

, (Application filed. I131. 12, 1699.) (No Model.) 5 Sheets-Sheet I.

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N0. 660,253. Patented 0012. 23, I900. J. KEITH. APPARATUS FOR PUMPING 0R COMPRESSING GAS AND AIR.

(Application filed Jan. 12,1899.) (NOMD 5 Sheets-Sheet 2.

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No. 660,253. Patented Oct. 23, Manor J. KEITH. APPARATUS FOR PUMPING 0R COMPRESSING GAS AND AIR.

(A lication filed .nm, 12, 1899.)

(No Model.) 5 Shani-Sheet 3,

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Patented Oct. 23, I900. J. KEITH. APPARATUS FOR PUMPING 0B COMPRESSING GAS AND AIR.

(Applicatioxi filed. Tan. 12, 1899.)

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No. 660,253. Patented Oct. 23, I900.

' J. KEITH.

APPARATUS FOR PUMPING 0R COMPRESSING GAS AND AIR.

(Application filed Jan. 12, 1899.)

(No' Model.) 5. Sheets-Sheet 5.

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UNITED. STATES:

P TENT OFFICE JAMES KEITH, OF LONDON, ENGLAND.

APPARATUS FOR'PUMPING"ORFCOMPRESSING GAS ANo'AIR.

SPECIFICATION forming part of Ilhetters Patent No. 660,253, dated Ccto'ber 23, 1900.

Application filed January 12,1899. Serial No. 701,954. (No model.

To all whom it may concern: i

' Beit'known that I, JAMES KEITH, of 27 Farof July, 1898, No.15,291,)of which the following is a specification.

This invention has for its objects to simplifyand improve the construction of gas-com-i pressing apparatus and to adapt it for compressing and mixing gas and air for illumi-I 1 I are provided, which are adapted to open on nating and other purposes.

pressor, and Fig. 3 a section, on a larger scale, of the motor employed to actuate the pump. Figs. 3 and 3 are horizontal sections on lines 00 a; and y y, respectively, of Fig. 3.

Figs. 4, 5, and 6 show, respectively, a transthat any suitable arrangement of non-return valves might be used instead of the form of valve-box and valves shown. Fig. 12 is a side elevation showing the connections between the gas-bell and the motor, whereby the supply of water to the valve of the motor is controlled.

The improved apparatus illustrated by Figs. 1 to 6, in which gas only is compressed, comprises a double-acting pump which consists of a pump-cylinder A, provided with an annular water-space B, formed between the pump-cylinder A and an inner open-ended cylinder 0, secured upon the same sole-plate D as the pump-cylinder A. Into this waterspace B a small gas-holder E dips, which holder constitutes the plunger of the pump, the water acting as a seal when the plunger E is moved up and down by means of a water-motor of the construction hereinafter de- The invention is illustrated by the accom-i panying drawings, Figure 1 being a vertical section, Fig. 2 a plan of the improved com-.

scribed. The gas to be compressedjis alternately drawn in and expelled both above and below the plunger E,'the gas being drawn in through pipes F G, which serve for outlets as well as inlets, communicating one,F, with the interior or lower side and the other, G, with the exterior or upper end of the plunger E,

the other ends of each of these pipes being connected to an inlet chamber or chambers H I in a valve-box J, connected to the gas-supply'by an orifice J and provided with valves H I, adapted to open on the suction-stroke of the plunger E. A second set of valves H ihe'eXpulsion-stroke of the plunger E and permit the gas previously'drawn into be,

regulator K, which is weighted at the bottom by means of a ring K to give the desired pressure to the gas or air contained within it,

dips into a water-space L, contained between the pump-cylinderA and an outeropen-ended cylinder or casing M, provided with an overfiow N, and is adapted to control a cock u on the water supply pipe e of the motor by means of a rod S, connected at its upper end to receiver K at a: and at its level end to the the rising and falling of the receiver.

The motor employed preferably consists, as shown atFigs. 3, 3 and 3 of a piston a, connected to the pump-plungerE and working in a cylinder 5, situated within the innermost cylinder 0 of the pump, a main valve 0, composed of two pistons and operated by the pressure-water, and an auxiliary valve (1, composed of three pistons and adapted to be moved upward by the action of the lower end of the piston a upon a tappet at the upper end of the rod of the valve 01 and downward by the exhaust-water from the under side of the piston 0., these valves working I in liners f D, respectively, in a valve-casingf. The liner f is provided with orifices f, which alternately admit the pressure-water to the under side of the piston a and the exhaustwater therefrom, and the liner D, having ports d d which admit pressure-water to the under side of the main valve C and ports d 70 a gasreceiver K, which surrounds the pump portion of the apparatus. This receiver or ply-pipe e enters an orifice e in the auxi-l-iaryvalve-casingf, where it acts constantly on the upper or smaller end of the main valve Gland from where it is taken by a pipeg to the upper side a of the motor-piston a, on which it also constantly acts. The action of the :motor and valves is as follows: Assuming the pumpplunger to be at the lowest point of its stroke and the auxiliary valve consequently at its lowest point and the main valve in its high- E est position, which latter valve until this in- I. stant, when the auxiliary valved arrived in its lowest position, was receiving pressurewater from the orifice e by Way of the passage 6 (shown in dotted lines, Fig. 3) and ports d and d in the liner D, in the position in which valves 0 (Z are shown the main valve 0 is just about to reverse, because the auxiliary valve d has established such connection between two series of ports d d in a liner D in the valve-casingf that an opeuing to an eXhaust-passagef, leadinginto the innermost cylinder 0, is allowed to the presj sure-water 10 pass, as shown by the arrows, to said passage f from behind the larger end 1 c of the main valve 0 and because the pressure-water, constantly acting on the smaller end 0 of said valve, is now able to efiect re: versal. c to the lower end of its casing f has taken \Vhen this reversal of the main valve place, the pressure-water at the upper end c is able to pass, as shown by the dotted arrows, by way of a series of ports f in a liner f in said casingf to the under side 0!, of the piston a, where it acts on a greater area than the pressure-water, constantly acting on the upper end of said piston, and so 'causes the motor-piston a to rise to the upper endof its stroke. As the motor-piston a nears the upper end of its stroke it acts on the nuts or f tappet on the upper end of the rod of the auxiliary valve cl and carries said valve upward (notwithstanding the action on the upper end of the valve dd of the pressure-water) with it until the motor-piston comes to rest The effect of at the upper end of its stroke. so moving the auxiliary valve is to shut oil? communication between the ports d and the ports d and to establish communication, as

shown by thedotted arrows, between the ports 1 cl and a series of ports d in the same liner, 1 the latter ports communicating constantly by way of the pipe 6 (shown in dotted lines at Fig. 3) with the supply-orifice e in the eas ing f. The pressure-water from the interior of the liner D, admitted thereto from the pipe 6 by the ports d, now passes through the l,

ports d to the under side 0' of the main valve 0, when, acting on a greater area than the pressure-Water constantly acting onthe upper side of said valve, it forces it to the upper end of its stroke, thus cutting off connection between the pressure-water orifice e,'the

portsf in the .linerf and the bottom a? of the motor-piston ct'and establishing communication byway of the ports f and d" in the liners f and D, respectively, between the under side a of the motor-piston a and the exhaust-passage f leading to the interior of theinnenmost cylinder 0, whereupon the pressure- Water, acting upon the upper side a of the motor-piston a, causes said piston :to returnto its original position at the botton of its cylinder, and the exhaust-water driven out by the descending piston acts to return the'yalve 61 also to its lowestposition.

This completes one cycle of operation, and during the upward stroke of the piston gas is drawn in through the pipe F to fill the space between the surface of the water and the inner surface of the plunger E, while at the same time the gas formerly drawn in through the pipe G and filling the space between the outer surface of the plunger E and the cylinder A is being expelled. At the next or downward stroke .of the plunger E the under side of said plunger is expelling while the' upper is sucking in gas.

In the modification of the invention illustrated by Figs. 7 to 11, in which the apparatus is designed to draw in a proportion of air with the gas and compress both for use, particularly in incandescent gas-lighting, anadditional annular or double cylinderE, open at its upper end, as shown particularly at Fig. 7, is provided, which is fixed to or forms part of the plunger Eand dips into the water contained in the inner cylinder 0, se-

cured to the sole-plate D and referred to in at the open end of the double cylinder E" over the top of theplunger E into the Water seal B, formed between the inner and outer cylinders OA of the pump apparatus. Into this annular 'or double cylinder E dips a cylinder A, secured to and suspended from the cover of the outer cylinder A. These two cylinders E A form inner chambers, into the insides of which air is drawn, and into outer chambers formed between their outer peripheries and their adjacent cylinders gas is drawn at the same time, the gas and airbeing discharged from their respective chambers simultaneously and at the same pressure. The drawing in and. discharging of air and gas are accomplished by the addition to the previously-described modifications of an air-valve box 0, (particularly shown at Figs. 8 to 11,) having two separate pipes P Q, connecting to the top and bottom sides of the plunger E, and suction and delivery valves 0 O 0 0 as described with reference to Figs. 1 to 10, the delivery-chamberR of the air-valve box 0 being connected to the seal valve S consists of a closed box, which is boltedto the sideof the outermost cylinder or casing M and is provided with a pipe 0 open to the atmosphere. The waste water is carried down from the overflow N on the outer easing into the water-seal box by a pipe T and then overflows through a deep trap U. The airinlet pipe 0 dips about one-half inch into the water in this box S, which is of such capacity that in the case of back pressure through the air-valves the water will rise up both the air-inlet and overflow pipes O T, respectively, considerably more than the height due to the working pressure of the gas be fore the water-level gets below the bottom of the air-inlet pipe 0 This arrangement of water-seal box S prevents the gas escaping through the trap U, so that in the event of the air-suction valves 0 O leaking back when the apparatus is not in motion the water simply rises in the pipes according to the. pressure and also effectually washes the air, which is compelled to pass through the seal before reaching the air-valve box 0, thus preventing dust collectin gin the valves and other parts of the apparatus.

The mixed air and gas can either be taken for use direct from the delivery end of valvebox J or taken from the holder by a separate stand-pipe in order that they may be more thoroughly mixed.

The water-supply to the motor is controlled by the rising or falling of the gas-bell K by means of a rod S, connected at its upper end to the bell at w and at its lower end to a lever T on a cock U inthe supply-pipe 6'.

Having now described the invention, what I claim, and desire to secure by Letters Patent, is I l. A double-acting gas-compressing pump comprising a cylinder, a pump-plunger moving therein having gas-pipes for the inlet and discharge of the gas to and from the upper and lower sides of the plunger, a loaded gasholder or receiver surrounding the pump plunger and cylinder, a fluid-pressure motor for operating the pump-plunger, a cock controlling the supply of fluid to said motor and a connection between said cock and loaded gas-holder, substantially as described.

2. A double-acting gas and air compressing and mixing apparatus comprising a motor, a

pump-plunger comprising a double cylinder, a water seal into which the double cylinder dips, means for admitting water automatically to the water seal, an open-ended cyline der dipping into a water seal carried by the double cylinder, a pump-cylinder A,vair and gas pipes leading to the separated spaces formed by the double cylinder of the pumpplunger and the open-ended cylinder, a loaded gas-receiver surrounding the pump and means for controlling the water-supply connected with the said loaded receiver, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

. JAMES KEITH.

Witnesses:

WILLIAM CAMPBELL MEIKLE, J OI-IN JACK. 

